/Engine/Source/Runtime/UMG/Public/Slate/WidgetRenderer.h
void DrawWindow ( const [FPaintArgs](API\Runtime\SlateCore\Types\FPaintArgs) & PaintArgs, [UTextureRenderTarget2D](API\Runtime\Engine\Engine\UTextureRenderTarget2D) * RenderTarget, [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWindow](API\Runtime\SlateCore\Widgets\SWindow) > Window, [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) WindowGeometry, [FSlateRect](API\Runtime\SlateCore\Layout\FSlateRect) WindowClipRect, float DeltaTime, bool bDeferRenderTargetUpdate )